On the Beavers' next possession, Mannion connected with receiver Brandin Cooks three times for 81 yards. Terron Ward eventually found the end zone on a 1-yard run to give his team a 7-0 lead with 7:53 left in the first quarter.

The Bears responded with Chris Harper making a diving catch for a 45-yard gain, eventually driving to Oregon State's 11-yard line. But the Bears were held to a field goal, failing to score a touchdown for the 14th time in 24 red-zone possessions.

Quarterback Jared Goff threw an interception and lost a fumble on the next two possessions, and the Beavers took control.

After the fumble, Mannion found tight end Caleb Smith over the middle for a 16-yard touchdown, and Oregon State led 14-3 after the first quarter.

The second quarter was all Cooks, as the dynamic receiver continued to exploit the Bears' poor coverage and tackling. Cooks, the nation's leading receiver, scored on a 14-yard end-around and a 34-yard screen pass. He finished the half with nine catches and 211 yards from scrimmage.

As they have all season, the Bears failed to get early production on the ground and finished the half with 2 net yards rushing. They failed to score again in the first half after the early field goal and entered halftime with a 28-3 deficit.

Mannion and Co. picked up right where they left off after the intermission.

On the opening drive of the second half, the Beavers drove 75 yards on eight plays and padded their lead with a 28-yard touchdown pass to Storm Woods from Mannion, who played at Foothill High in Pleasanton.

On the ensuing possession, Goff lost another fumble as the ball slipped out of his hand as he cocked his arm. After his third turnover, Goff was benched in favor of Zach Kline.

"I'm extremely upset at myself, and I need to play better to give us a chance to win," Goff said.

Kline provided a late spark for Cal, orchestrating a 15-play, 88-yard drive capped by a 7-yard touchdown pass to Darren Ervin that cut the deficit to 35-10 with 3:39 remaining in the third quarter.

Mannion put out the flame shortly thereafter, throwing his fourth touchdown pass on the ensuing possession to give his team a 42-10 lead.

The two teams traded touchdowns in the fourth quarter.

Cooks finished with 13 catches for 232 yards and two touchdowns to lead Oregon State.

In his second collegiate game, Kline completed 11 of 16 passes for 71 yards and two touchdowns. He added 28 rushing yards, but also threw an interception.

The Bears entered the game as the second-worst pass defense (321.8 yards per game) in the country and now rank last. They dropped their 11th straight game to an FBS opponent.

"We just have to keep working," Dykes said. "I'm going to roll up my sleeves tomorrow and get back to work."